Assessment of heterogeneous electron‐transfer rate constants for soluble redox analytes at tetrahedral amorphous carbon, boron‐doped diamond, and glassy carbon electrodes
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2016-07-20 |
| Journal | physica status solidi (a) |
| Authors | Romana Jarošová, Paula M. De Sousa Bezerra, Catherine A. Munson, Greg M. Swain |
| Institutions | Michigan State University |
| Citations | 34 |
Abstract
Section titled “Abstract”The electrochemical properties of a nitrogen‐incorporated tetrahedral amorphous carbon (ta‐C:N) thin‐film electrode were investigated. Cyclic voltammetry was used to investigate the background current response as a function of potential, scan rate, and electrolyte composition. Cyclic voltammetry and digital simulation were used to determine the heterogeneous electron‐transfer rate constants ( k o ) for IrCl 6 2−/3− , Fe(CN) 6 3−/4− , ferrocene carboxylic acid, Ru(NH 3 ) 6 3+/2+ , and methyl viologen. The results revealed that the background current for the ta‐C:N electrode falls between that of BDD and GC. k o values for all the redox analytes at ta‐C:N were comparable to the values at BDD and GC. k o values were lower for Fe(CN) 6 3−/4− , 10 −3 cm s −1 , than for the other four redox systems, 10 −2 -10 −1 cm s −1 . k o for Ru(NH 3 ) 6 3+/2+ was insensitive to the electrolyte cation (Li + , Na + , K + , and Cs + ) at all three electrodes. In contrast, k o for Fe(CN) 6 3−/4− was sensitive to the cation type with the greatest sensitivity seen for the ta‐C:N electrode suggestive of more significant double layer effects. The ta‐C:N electrode supports relatively rapid electron transfer for a wide range of redox systems with formal potentials from ca. 0.9 to −1.0 V vs. Ag/AgCl.
Tech Support
Section titled “Tech Support”Original Source
Section titled “Original Source”References
Section titled “References”- 1991 - Electroanalytical Chemistry